Reproducing apparatus

Abstract

A reproducing apparatus includes a reading unit configured to generate a reproduced signal containing information data recorded in a track using a reflected light of an optical beam, a clock generation unit configured to generate a clock having a frequency associated with a wobbling cycle of the track, and a control unit configured to detect a phase difference between the reproduced signal and the clock, and to control the clock generation unit using the phase difference detection result.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a reproducing apparatus, and more particularly, though not exclusively, to an apparatus for reproducing data from a disk recording medium. [0003] 2. Description of the Related Art [0004] A high-density optical disks (e.g., a digital versatile disk (DVD) or a blu-ray disk) have been developed conventionally. [0005] In a disk of this type, a groove is spirally formed thereon, and an optical beam is applied using this groove as a recording / reproducing track to write / read information. To superimpose addresses on the disk or to obtain a clock during reproduction, the groove is formed beforehand wobbling in a fixed cycle on the disk. When performing reproduction, an optical beam is applied to this wobbling track. From its reflected light, a clock associated with the wobbling cycle is generated, and address information is read. A clock, synchronized in phase with information contained in th...

AI Technical Summary

Benefits of technology

[0010] At least one exemplary embodiment is directed to a method that facilitates the stable rotation of a disk.

Problems solved by technology

Thus, problems of increases in circuit size and costs have inevitably occurred.

Furthermore, unevenness in temperature characteristics, or processes between the two PLL circuits can cause a change in clock frequency, creating a problem in reliably obtaining a stable clock.

Images